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F. W. WOLF.

REFRIGERATING APPARATUS.

APPLICATION FILED NOV. 3. I9I6.

1,314,233. Patented Aug. 26, 1919.

Mineu:

- UNITED STATES PATENT onnron.

FRED W. WOLF, OF DETROIT, MICHIGAN, ASSIGNOB, BY MESNE ASSIGNMENTS, TO THE ISKO COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

REFRIGERATING- APPARATUS.

Specification of Letters Patent.

Patented Aug. 26, 1919.

To all whom it may concern Be it known that I, FRED W. WOLF, a citizen of the United States, and resident of Detroit, Wayne county, State of Michlgan, have invented certain new and useful Improvements in Refrigerating Apparatus, of which the following is a specification.

This invention relates to refrigerating apparatus and particularly to the refrigerating coil and thermostat arrangement thereof.

One of the objects of the invention is toprovide an effective arrangement of the piping of a refrigeratin coil.

Another object of t e invention is to form the refrigerating coil with a vertical passage therethrough in which to arrange the thermostat.

Other objects of the invention will appear :from the following description taken in connection with the drawings, which form a part hereof, and in which:

Figure 1 is-a perspective view of a refrigerating apparatus embodying this invention, and 4 Fig. 2 is plan view of the refrigerating coil and thermostat shown in Fig. 1.

Referring to the drawings, 10. represents a domestic refrigerator of the usual type, the view in Fig. 1 showing one of the doors 11 open and exposing the refrigerating compartment 12. Part of the front Wall of the refrigerator is also cut away to more clearly show the interior of the compartment.

.Mounted on top of the refrigerator in an otherwise convenient place is a compressor 13 driven by a motor 14 through a belt 15,

and a condenser coil 17 having its outlet end 17 extending into the compartment 12 above referred to. The inlet end 18 of the coil 16 is connected to the compressor and a pipe 19 leads from the interior of the compartment 12 to the compressor.

Within the compartment 12 is a refrigerating coil 20, supported as by corner brackets 21, and connected to the outlet end 17 of; the condenser 16 through a suitable expansion valve (not shown) and to the compressor 13 through the pipe 19, above described. This' refrigerating or expansion coil 20 comprises a considerable length of piping coiled to approximately fill the compartment 12 which as shown is nearly cubical in form. The coil may be said to be of hexahedron form and the piping is so coiled as to provide several vertical air passages 21 therethrough. As shown the coil is made up of a number of layers of piping, each of which layers is substantially of W form and adjacent layers turned 90 degrees from each other and all layers joined together in series. In plan therefore the coil is substantially square as shown in Fig. 2 and the piping permits a free passage of airthrough the coil while at the same time employing a large amount of piping in a comparatively small space.

With the coil shown it is possible to employ a thermostat 22 of elongated form and yet arrange it substantially within the coil Where the greatest variation in temperature takes place. Thus the thermostat is shown as supported within the compartment 12 by' the block 23 and suspended in one of the corner air passages 21 above described. The thermostat comprises the U shaped bar 24 which operates a switch 25 closing a circuit through one or another of two solenoids 26 and 27 by means of conductors 22, 28, 29, and 30 and battery 31. Each of the conductors 29 and 30 is broken as at the terminals 32 and a swinging switch block 33 is adapted to connect one or another pair of these terminals depending upon the position of the solenoid bar 34. Said switch block 33 also operates to open and close the main circuit 35 of the motor 14 at the terminal 36.

Thus it will be understood that the thermostat 22 will control'the operation of the motor 14 in a well known manner. In the position in which the parts are shown in the drawings the terminals 36 are connected and the motor 14 is in operation. As the operation of the device lowers the temperature in and around the coil 20 to the critical point, the bar 24 contracts and throws the switch 25 to energize the solenoid 26 and the bar 34 is drawn to the left.- This movement causes the block 33 to swing quickly on its pivot and break the circuit 100 35 and thereby stop the motor 14. B this movement of the block 33 the con uctor 30 is also broken but a connection is made in the conductor 29 so that the latter is ready for the reverse movement of the 105 In a refrigerator apparatus of this type 110 g I m 1,314,233

- without departing from the spirit or scope thereof as defined by the claims;

. 1. In a refrigerating apparatus, a refrigcrating coil comprising a pipe coiled to form substantially a h'exahedron with nine symmetrically arranged air passages extending vertically therethrough. Y

2. The combination with a refrigerating machine having an expansion coil formed with a substantially vertical air passage the'rethrough, of a thermostat arranged in said air, passage and connected to control the operation of said machine.

3. The combination with a reirigeratin machine having an expansion coil forme the" use of air with a substantially vertical air passage therethrough, ofan elongated thermostat arranged in said air passage and connected to control the operation of said machine.

4:. The combination with a refrigerating machine having a support and an expansion coil suspended from said support, said coil being formed with a vertically extending air passage therethrough, of a thermostat also suspended from'said support and arranged in said air passage, said thermostat being connected to control the operation of said machine. 1 Y

5.. vA refrigerating coil comprising a plurality of layers of piping, each layerbeing of substantially W form and adjacent layers being turned 90 fromeach other and all layers joined together in series.

In testimony whereof I aflix my signature. at

FRED W. WOLF. 

